diff --git a/librb/configure.ac b/librb/configure.ac
index 33b989089..0c49a66bd 100644
--- a/librb/configure.ac
+++ b/librb/configure.ac
@@ -104,7 +104,7 @@ AC_TYPE_UID_T
 dnl Checks for header files.
 AC_HEADER_STDC
 
-AC_CHECK_HEADERS([crypt.h unistd.h sys/socket.h sys/stat.h sys/time.h time.h netinet/in.h netinet/tcp.h arpa/inet.h errno.h sys/uio.h spawn.h sys/poll.h sys/epoll.h sys/select.h sys/devpoll.h sys/event.h port.h signal.h sys/signalfd.h sys/timerfd.h linux/tcp.h])
+AC_CHECK_HEADERS([crypt.h unistd.h sys/socket.h sys/stat.h sys/time.h time.h netinet/in.h netinet/tcp.h arpa/inet.h errno.h sys/uio.h spawn.h sys/poll.h sys/epoll.h sys/select.h sys/devpoll.h sys/event.h port.h signal.h sys/signalfd.h sys/timerfd.h])
 AC_HEADER_TIME
 
 dnl Networking Functions
diff --git a/librb/include/rb_lib.h b/librb/include/rb_lib.h
index 4003a832d..7ef473a95 100644
--- a/librb/include/rb_lib.h
+++ b/librb/include/rb_lib.h
@@ -10,10 +10,6 @@
 #include <signal.h>
 #include <ctype.h>
 
-#ifdef HAVE_LINUX_TCP_H
-# include <linux/tcp.h>
-#endif
-
 #ifdef __GNUC__
 #undef alloca
 #define alloca __builtin_alloca